Advantages

XNUCLEO can be configured by jumper to compatible with UNO (default) or Leonardo

Arduino ICSP interface

Yes

None

ICSP is required by certain kinds of shields

USB connectivity

Yes

None

The USB connector of NUCLEO is for debugging ONLY, not available for USB connection

USB connector

Micro USB

Mini USB

Micro USB is the advanced USB standard

Morpho headers mark

Most

None

Now you can check the PCB mark instead of datasheet

Common interfaces are connected via

Jumpers

0Ω resistors

Jumpers are much easier to use, need no soldering

UART debugging

Available while in-circuit debugging

Not available while in-circuit debugging

The NUCLEO integrated ST-LINK/V2 functional chip can be simulated as serial port, however, it's not available while in-circuit debugging, whereas XNUCLEO features a stand-alone USB TO UART chip.

8MHz crystal

Yes

None

Timer is more accurate when using external 8MHz crystal

32.768KHz crystal

Yes

None

Required for RTC

USB fuse

Yes (500mA)

None

The computer USB interface might be harmed without fuse

LEDs

4

1

The more LEDs, the easier to monitor program running status

UART indicator

Yes

None

Data communication is visible now

DC input

Yes

None

A convenience

Button position

Close to PCB edge

Close to Arduino connector

The button won't be untouchable when connecting with an Arduino shield if it were close to the PCB edge

ST-LINK

Separated

Integrated

ST-LINK can be used anywhere else

Comes with USB cable

Yes

None

ABOUT US

Here at Contempo Views, we are dedicated to promoting science and education for both children and adults through hands-on robot creation. Our full kits are so easy to use and assemble that even a novice can quickly become an expert in robotics! It is our hope that our products will encourage you to pursue an interest in engineering or the sciences, be it as a hobby or a full-fledged career.
For the electronics and programming enthusiasts out there, we also sell a wide variety of parts for computers and controllers such as Arduino, Raspberry Pi, Grove, and Beaglebone. With these devices, projects like creating a custom LED-display or alarms & sensors become easy for both novices and experts alike! You can even program your very own video games. The possibilities are infinite; you are limited only by your imagination.